218169930 has 32 divisors (see below), whose sum is σ = 571209408. Its totient is φ = 52889600.

The previous prime is 218169923. The next prime is 218169937. The reversal of 218169930 is 39961812.

It is an interprime number because it is at equal distance from previous prime (218169923) and next prime (218169937).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218169937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330231 + ... + 330890.

It is an arithmetic number, because the mean of its divisors is an integer number (17850294).

Almost surely, 2^218169930 is an apocalyptic number.

218169930 is an abundant number, since it is smaller than the sum of its proper divisors (353039478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218169930 is a wasteful number, since it uses less digits than its factorization.

218169930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661142.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 218169930 is about 14770.5764951812. The cubic root of 218169930 is about 602.0025036411.

The spelling of 218169930 in words is "two hundred eighteen million, one hundred sixty-nine thousand, nine hundred thirty".